Transonic Combustion - Supercritical Gasoline Combustion Operating Range Extension for Low Emissions and High Thermal Efficiency Transonic Combustion

Format:

Conference/Event

Author/Creator:

Zoldak, Zoldak, author.

Contributor:

Boer, Chris de

Shetty, Shreeram

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

A novel combustion process has been developed utilizingsupercritical gasoline injection-ignition for light-dutycompression ignition engines known as Transonic Combustion orTSCi. Previous publications have demonstrated results forimproving fuel economy and emissions under light-load operatingconditions typical of those for passenger car vehicles.The TSCi combustion process exhibits similarities with HCCI,LTC, PCCI and RCCI with high indicated thermal efficiencies(greater than 45%) and simultaneous reduction of NOx and PM at highEGR levels. The use of EGR at low and medium loads has shown astrong impact on NOx without compromising particulate emissions.However at higher loads with HCCI, LTC, PCCI and RCCI the operatingrange is limited by excessive pressure rise rates and control ofcombustion phasing, whereas the TSCi combustion process, due toits partially premixed and partially stratified mixturepreparation, is not limited in the same manner. For the TSCiprocess the use of copious EGR levels have demonstrated to beeffective in reducing NOx and cylinder pressure rise rates whilemaintaining start of combustion control and low soot emissions atlight load conditions.The test results presented in this paper are from extensivesingle-cylinder engine studies. The results demonstrate theoperating range capability of the TSCi process at low loadwithout EGR, medium load with use of EGR, and high speed low loadwith EGR. The results further the technical understanding of theperformance of the TSCi process into operating regionspreviously unattained. The impact on thermal efficiency, NOx, PM,hydrocarbons (HC), and carbon monoxide (CO), as well as the abilityto control pressure rise rates, combustion stability, combustionduration and ignition delay will be presented. The impact of SOI,Boost, fuel temperature and intake temperature on the supercriticalcombustion process are also reported

Notes:

Vendor supplied data

Publisher Number:

2012-01-0702

Access Restriction:

Restricted for use by site license